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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '054a2e94cacb8c3ff68db047bbf3092c0f6791f3a2401b4043fcb361c67882be' 
  AND token = 'qdb724JdH+VuJ65yWF3SW2p8ME3H1IMVuyu1A/LwxVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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