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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b43a1d76829ea8b720cd45c1a912fd062b21a822dd497a31c33f29e494170ca' 
  AND token = 'iTGLfxVJSGlOjJ8/RSYXjtek/JSGNtGr+aYh4dryvfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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