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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ffc982ad5a1a013e95e500d6e63ad04627bbf708cf7a956e0abb773e8692fbb' 
  AND token = 'Jbop6lC/INhNjqN61Xk2RA2mKQxMmwvZF7NMyG9Z6J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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