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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d57803a29a1c3c6804e0b149138f4900d47b59d17fe80df3291a692bf80d801' 
  AND token = 'NF/Ml/cMjEHVFUrf5Gmt3IgS0yCtuCD33ucZXpMTBBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}