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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb6b9d1acac82ebce399970d91513b3fdddf72ea23e300f834d76937b3a08e31' 
  AND token = 'zFmq//peUwVliYTmWF8AW6/NmK3Vb8yuRZ1MoyVWOOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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