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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7be86dd46ac01e178cf77b8d43ccd0134fd083ad4ca0c70842af0afd3b488041' 
  AND token = 'buPzho/G40sTaGYIL/WOdH3LKqBFI4x9fOleKyboXl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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