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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcac207974fed35a8cd3bfe0c863e7b5dc70cb39b6fc35703e8dab6f2f5b2e16' 
  AND token = 'fdwm8d7d0jiFvXXPHKOXs9dviBNv76WXtVNOPAZloJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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