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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb4342143c3f7f530bccbb4234950dfce03ebf0a1b145acbcd1e121b3d7ed1e0' 
  AND token = 'YD8E+eqx+ypbjpFc5RqYbcuQsLTi4BGomf6ZVWFn1kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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