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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b907a13602b4360566de4b15b1ef1fddf77ac4360ca2dc82c677377ae675d41b' 
  AND token = '8f8Gs18c0f43J2pcouIw16Pj+5aDE8AungGjmgzJF6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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