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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22e605207c493572abd061781e2dbb876c32fb1db2cd31b503d980fd9e4c0f64' 
  AND token = '3t3bkuWqgEY6FlSlDPkM3/q4dxkkZ5etve+wfa0cT1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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