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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91fef359692a8652f183b88217895c9cfcdb1949d987831863a3c1157c2aca08' 
  AND token = '5G5yR/YcHVWcXEt5micBjJXK7i3r3/O41hR6OjQEON0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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