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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab93a3c48fea3e772c3a7a159855a3f4d883b7352f94753efb14d5b9d9ed1f68' 
  AND token = 'b9xUUZCiN3kRNqf0cJSNfpqjYj+YGYPDNoTo3JRe38Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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