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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cfa24aafcad6948ab77c22bc80f548275b47fd5030e78b67f2500162ae68090' 
  AND token = 'LM0NA4c+BZ5Fu59eOja9Twejn3as7j8I7JKk3ZZciBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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