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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db77057386b2ecf7a26ddc294477cce890a317ccfc09d0f48b33ee9d4fb0e249' 
  AND token = 'EOvmvW5Pd5xoyFMnbUGqqcTRMzHaFdJjP9yqUv8XmuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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