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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bc7aaf334d3c1afbe9f37ef0bd801ee64d99393baa0f0c713b5412ccfc2b38a' 
  AND token = 'bpeWu4GeB+uuVjbXdCvpryVfaAJkZ86dpvxqGbJ9S8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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