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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3174770d08dcc6c376f66bea4bc40e9ffaadc7463422381ad8958fb7aa05d7d3' 
  AND token = 'l8rOCN14EDQVYfQd7F6GYRLTsf0084uvsxtkPKnNAtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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