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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c143e8228f938e9486d6202326a941778654894ee8fd039fe74df4ccc7bccd5' 
  AND token = 'a0mKRzN62cNqs0Iab9QO4qqRRKfzTmq5KesCFbuniJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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