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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66ecad80bf6dfd75ce351aea7bde37d66fd006c0c7dcd2bfd38da0ebfbc2ea0a' 
  AND token = 'Sg8RDrpX0uN268GIm+NBNbYm0XV8bmGl9qJV3XXjJcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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