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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8017caaaba1296394e0d5cfaf8fafa1a69b6b65885dce118d3cf3e994b3bb3dd' 
  AND token = 'pObgdhDKm7c2fcReR8PaOjeQvAuBrXdcTgyVkN72G8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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