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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd651e634f62ee70a498c6f92a8379610b8ad61fd11b87211cd9650e6f71c0b3a' 
  AND token = '3GLO1MMr9665KRqunP6lQw45GYsveOeQLroxfh6vHiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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