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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da72bf53eff3aaf67b22734c407c4657c13b3855739b5714e0969378537ff6e0' 
  AND token = 'hwJHx5ag7SaPZB1tD9dTkEcHK1a2EuGaZICP8j81B8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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