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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd61ac7473365eb7f8ef52d5b91871059f7bf9d8c22b5815c2eb859bc39b31464' 
  AND token = '8bCgn1zPt5CtrRL3qzYCtijW5Ipx2Si19JN3aiP1Vc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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