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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e418dc1c1418bce2ac6fb0f6e0187f042b1c2de3b9730409214f1fdb1cacce1c' 
  AND token = 'qY96ZIaO1ABdBF4NbzdoefbejH1weA5D0huoxkZLqWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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