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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c22fa0fa0941180bf26a3e3bc41904650ec0e9dda36707b998f51acb1691f5da' 
  AND token = 'jKmfHpw54qjoMdbc4bXaX2vBcItDkd8sjAKVL+kjysg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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