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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6d556e2b55a5ee4d6826caca2d070c234b34bd6e5ed181250bc4e27cda8666e' 
  AND token = 't6UReYtDaUkam7Of74QnbuBpHnmdUtjKPKc9Nj00/Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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