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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9f1ce7b1ce88fa1fd02e83075d0b5996e6967750e59f932477b6af3b94ed3b1' 
  AND token = 'EDzmeUGKlB12n0tu0WaLnyAoQamD1CjEBlP1X2J9WsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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