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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44f4c68e02b1d907e4cf3cf44d4afcdc505f0c245409600bd211edbf9066a85d' 
  AND token = 'hpZSrKKaY9x3amdR4DLMNlzJAn02NyXQd/y5LckSPrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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