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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae79afdbc3803fced45a6ea3bb27138ea054eb63787b6697aa5500ef99949d3d' 
  AND token = 'WSB0+d8yboOnj//XI4juTSQjF2nk6gKU294bgw/4TL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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