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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef7b86193b7ad2369e6e09a06f644f5166eb91ca0afe3e29ff980cde113b58f6' 
  AND token = 'offKxslt1Vo9wgD11JPMH675EEnXz5HBWgbcYkConBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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