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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '454a2b89d3213f071d0ffd4aafe1bd52be95ef0dad874d7deacb66407fceaa79' 
  AND token = '915CEai8/4g/aJzXXYa3DEC/KOeTw2Ifi5f4FVGIf3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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