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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cc8b6ff400f8668d5d4100ed89cf7c7fa6546bf04549c8f0c7dfa94a52fed9d' 
  AND token = 'Ikx7R/sThJpNGrfW8BUrrpdl4WHjSMDvfexrFtIyIYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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