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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4e6217deeee8a1c538fa4b67e77d4b5caf2419bc43e657f364fc7ab5fe224ab' 
  AND token = '+s8auNLsiozg31KCwlowDcNBnMwb/PK9gu27yoNQejE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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