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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '420774c191fe7ca7b2513d30b0e62acdba1cd57373cfd5e93808b9407512b039' 
  AND token = '/dfMN8y40iYHfPNj1dAJkcx6vALVpv4+KjmuewNNLhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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