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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd8c5191a5189918ab342d75e6c54bdcb71b9d3ce9ec4358c14f4b8772d23b2e' 
  AND token = 'w8mfghaU/VIwx6JsydegAOLrIuSMc9wmZ5q1R/q21ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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