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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '851b4b079cfb3cca53a5b2acf11bd5a6c5aa499e4ffbbe6191cf3ebb2f899f39' 
  AND token = 'OFgBors4YtvFt2KsB8HH1a8X5dliC9sT5g4dgSaLrmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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