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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '806c44e2956a303e1c63d127b05786d7ed202c2503f6906826cbeb46a0ca61ba' 
  AND token = 'mowGu/q+8sY9CwxYd4hV1bSdn/xb889S4OQFO0PqKxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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