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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e4ac2e4b9ff557ab4e04e1fcdf4d6a4ed91ebc400806fb9b5598b869820f925' 
  AND token = 'yxlOzyxJ81NQcM2Q5g+oYzklVdFJPYJA1PSPDLHFehw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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