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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64db655186902f7903f47ab760e815fca045254975c4858839161a5136d5dc65' 
  AND token = 'C9fKSAeTebRg817jnLgHM9Z9xs+sViN51q3Amw3vipQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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