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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0bc78876aefe52cfca5a50cfea8a7ea639b9e1a369f6c3cc4145cd2e1d00311' 
  AND token = 'Lq0G2uR5cwRmxWwIQr0pOUBb72al2LMyNBMsq6tseGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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