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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e11009f45e0209a0b1482f87b89b8a7142bab8e90435f65772442dc89193137c' 
  AND token = 'KkYTmWW8Yei4icrn9qOmp6romZSE7aOvQhBNcQwcrnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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