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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68fa68f8922cea5b434ed40f7979c3285ff093754d6ecf33020cc3185e7e4f55' 
  AND token = 'mHfNcDs59EF0BiB5lp903Xfq4xQ1T3vrqh/NaoiSd88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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