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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38e9a9ea56a18ab8db53b40dd80513449bd0b1559eb558123ec556491bc44167' 
  AND token = 'w5ZniPzsg5S7mCOt2DlBrdy+tvC9MERyArHVlHSG9K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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