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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6dee2ac93a96c7ff81fba14360b1e0d120c892fbe14fb74e949508674d8d149' 
  AND token = 'FKHbhv/f+eWKC1hRxlSOXECUeAnB2l8x56uae5icZxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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