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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd40b97efa7ecbb4f54f76a23cb099c51b34cb9b7d525ee92210473bd38362d48' 
  AND token = 'xuVONJg/xKkzRcbSBODUfbuP7RIx3YccLpH5jt1Qu0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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