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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a59089c862c3f23b4f5cc7e4c9d0c02d3c4506a0f9fddc73e75bd71262796d91' 
  AND token = 'oxj/QNx2NFq65RGe7W/PaC8WYBQU4ManpBQmG3b3N/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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