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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '196c1d2759a228d2f546a4d2a2b4507ca88c14bca2d1b8352faf765eb8fc6e20' 
  AND token = '0tdToZ9gZtiVH+uBvgcUqUntgGcA7P+sGQ9Td4ni7Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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