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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f071b9008d1647122f50502b47213ae672e1378ae9a41febb4c33af04a6711c7' 
  AND token = 'xgTCSNhiXavgWv2twAEWzP06Kn3yRDfZ2Jdjp1MN06A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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