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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e20090b291d7ebd13ad01b17268f2d3362cbcf22bf3c490f83b761bd02358ecb' 
  AND token = 'uUpbDlNgreH+iKWzOZjAfrF/M1OA6xw2rpjbKSblS+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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