SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6bfa264e603b95c8ded9fdc8490bd8923415863deb7e03539f29aa767c032c3' 
  AND token = 'RD6w69xSoJRl+UtowFLbkkPKfjy/JcCtbHJvwOSzPMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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