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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '462e6cb1f0191a46d298f60f0411d52599ae82900dc0266332e9cc07e8165a65' 
  AND token = 'eun/sig/88+eN+Rcw5XEQoglFpRCC4Rrh/4NLyCS3iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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