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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce39d7784f61cf2fa2b40cf68bcb898079e14b9ee4cb195c0a4fa2fe7ba9cea6' 
  AND token = 'UbsaKX6gUXZwZn7TS7SAsY1eHNK40D/qzbwnhfIWt6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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